Frequency Distributions

The correct answer is 5. x i f i d i= x i -5 f i d i 2 f f d f 23 -3 27 -9 36 -2 24 -12 416 -1 16 -16 50006919975220108635418 σ_{x}^{2} = σ_{d}^{2} = \frac{\sum f _{i} d _{i} ^{2}}{\sum f _{i}} - (\frac{\sum f _{i} d _{i}}{\sum f _{i}})^{2} = \frac{150}{45 + α} - 0 = 3 \Rightarrow 150 = 135 + 3 α \Rightarrow 3 α = 15 \Rightarrow α = 5

Chapter Questions
1 MCQs